I played this game, and it was really cool!
I liked the puzzles, the animations, and the music. My favorite parts are seeing the fox every now and then. I think my favorite puzzle was the last one, because it brought all the elements together. My favorite building is definitely the hut with the underground bunker.
However, it was a bit frustrating too. Sometimes trying to drop an object after examining it is less easy than it should be, and trying to balance examining with opening up tab to see the notes, it has a few rough edges.
The UI is generally awful, bland, and doesn't fit the game at all. If the whole UI looked like the main menu or the final note at the end, it would be much better. The notes system, however, was pretty good and I enjoyed the way you implemented that.
The "tutorial" isn't sufficient at teaching the controls for things like viewing the notes so far. Also, I was a bit disappointed that the previous notes weren't useful for the final puzzle. I thought it would have been cool if the previous notes somehow had clues for the final puzzle.
The sensitivity is all over the place. I couldn't find a sensitivity I was comfortable with, and I don't know why.
Sometimes it was hard to see the shapes clearly. Such as seeing that the front door of the "apse" was open when the rest of the windows were closed, or seeing the fox at the end (I never saw it, but only in other's play throughs).
Also I wonder if there's an alternate ending? Like one where you don't get burned up by the sun?
Overall, I really enjoyed the game. I really can't put into words how much I liked this game, so I'll just show you my playthrough instead: